there are ingredients put into these bars that don't show up as sugar such as HFCS, hydrogenated oils, caramel color, etc etc that are just as bad (if not worse) for you and illicit an even worse response than
you always want to read the ingredients. but let's say that a bar has clean ingredients hypothetically, it is still processed right? and it is still pasteurized so it can sit there on the shelf at the supermarket for weeks and weeks right? hence it still isn't going to be healthy for you
protein bars and powders are a scam for the reasons above
if you want a snack then get some raw nuts or fruit